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Revenue Recognition - Impact on Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue	$ 232,221	$ 266,042	$ 613,052	$ 583,161
Cost of revenue	58,860	68,061	153,227	142,757
Gross margin	173,361	197,981	459,825	440,404
Operating income	77,844	110,849	175,895	208,086
Income before income tax expense	81,273	112,752	185,825	213,793
Income tax expense (benefit)	837	10,259	11,976	9,334
Net income	$ 80,436	$ 102,493	$ 173,849	$ 204,459
Basic (usd per share)	$ 0.47	$ 0.59	$ 1.01	$ 1.18
Diluted (usd per share)	$ 0.45	$ 0.57	$ 0.98	$ 1.14
As previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue		$ 259,739		$ 567,585
Cost of revenue		62,360		128,056
Gross margin		197,379		439,529
Operating income		110,247		207,211
Income before income tax expense		112,150		212,918
Income tax expense (benefit)		9,802		8,843
Net income		$ 102,348		$ 204,075
Basic (usd per share)		$ 0.59		$ 1.18
Diluted (usd per share)		$ 0.57		$ 1.14
Accounting Standards Update 2014-09 | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue		$ 6,303		$ 15,576
Cost of revenue		5,701		14,701
Gross margin		602		875
Operating income		602		875
Income before income tax expense		602		875
Income tax expense (benefit)		457		491
Net income		$ 145		$ 384
Basic (usd per share)		$ 0.00		$ 0.00
Diluted (usd per share)		$ 0.00		$ 0.00

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- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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